Sedimentary unit 4 (SU4) comprises a layer of greyish-brown (10YR/5/2) loam with pebbles up to 5 cm in diameter at a depth of 78-40 cm, overlain (40-23 cm) by brown (10YR/5/4--yellowish-brown to 5YR/4/4--reddish-brown), loose and stratified sand with gravel in its lower part.

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